docs: def _get_parsers(self, name):
          """Return the appropriate parser asked by the user.
  
          Todo:
              Change `Ontology._get_parsers` behaviour to look for parsers
              through a setuptools entrypoint instead of mere subclasses.
          """
  
          parserlist = BaseParser.__subclasses__()
          forced = name is None
  
          if isinstance(name, (six.text_type, six.binary_type)):
              parserlist = [p for p in parserlist if p.__name__ == name]
              if not parserlist:
                  raise ValueError("could not find parser: {}".format(name))
  
          elif name is not None:
              raise TypeError("parser must be {types} or None, not {actual}".format(
                  types=" or ".join([six.text_type.__name__, six.binary_type.__name__]),
                  actual=type(parser).__name__,
              ))
  
          return not forced, parserlist